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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fc75f5cf1bf011e6780476fcee9774bccb22a6af1fdeb76d8e2726c12b69fe4' 
  AND token = 'xC3QJwSCeVDnUoe4lSVRyyIeMRXfuxa8AK5UcxHz+2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}